I look at art as a container. You can't get inside it, so you have to ask all of these questions.

The quote suggests that, when looking at a piece of art, you cannot gain an understanding of its meaning without asking questions. You cannot get an insight, or an understanding, of the art by simply looking at it. To gain a greater understanding of the artwork, you must ask questions around what the artist was thinking when they created the artwork, what they hoped people would take away from the artwork, and why they chose the particular elements they did.